Add HipChat-inspired theme

data/themes.yml

@@ -208,3 +208,6 @@
 -
   :name: 'Douglas Rain'
   :colors: '#EDECEB,#E3E3E3,#DA552F,#FFFFFF,#D6D6D6,#534540,#DA552F,#DA552F'
+-
+  :name: 'Hip'
+  :colors: '#F5F5F5,#CCCCCC,#3873AE,#FFFFFF,#E9E9E9,#000000,#69AA4E,#999999'